View source for Selaginella densa

{{Treatment/ID
|accepted_name=Selaginella densa
|accepted_authority=Rydberg
|publications={{Treatment/Publication
|title=Mem. New York Bot. Gard.
|place=1: 7. 1900
|year=1900
}}
|common_names=Prairie club-moss;Rocky Mountains spike-moss
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Selaginella rupestris var. densa
|authority=(Rydberg) Clute
|rank=variety
}}
|hierarchy=Selaginellaceae;Selaginella;Selaginella subg. Tetragonostachys;Selaginella densa
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Selaginellaceae]]</div><div class="higher-taxon"><small>genus</small>[[Selaginella]]</div><div class="higher-taxon"><small>subgenus</small>[[Selaginella subg. Tetragonostachys]]</div><div class="higher-taxon"><small>species</small>[[Selaginella densa]]</div></div>
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>terrestrial or on rock, forming cushionlike or loose mats. <b>Stems</b> decumbent or creeping, not readily fragmenting, irregularly forked, without budlike arrested branches, tips straight; main stem upperside and underside structurally slightly different, conspicuously indeterminate, lateral branches radially symmetric, conspicuously or inconspicuously determinate, strongly ascending, 2–3-forked. <b>Rhizophores</b> borne on upperside of stems, throughout stem length, 0.2–0.35 mm diam. <b>Leaves</b> essentially monomorphic, in poorly defined pseudowhorls of 5 or 6, tightly appressed, ascending, green, linear to linear-lanceolate, (2.7–)3–5 × 0.4–0.7 mm (upperside leaves smaller than underside ones, also smaller on ascending buds); abaxial ridges present; base long-decurrent, oblique, and glabrous on underside leaves, slightly decurrent, oblique, and sometimes pubescent on upperside leaves; margins long-ciliate, cilia transparent, mostly ascending or spreading on proximal 1/2, ascending on distal 1/2, 0.07–0.17(–0.2) mm; apex slightly keeled to plane, rather obtuse, abruptly long-bristled; bristle white or transparent, puberulent, (1–)1.25–1.9 mm. <b>Strobili</b> solitary, (0.5–)1–3(–4) cm; sporophylls ovate-lanceolate, seldom ovate, abaxial ridges well defined, base glabrous, margins ciliate entire length or dentate near tip, apex usually long-bristled.</span><!--

-->{{Treatment/Body
|habitat=Prairies, alpine meadows, dry rocky slopes, rock crevices, sandstone, quartzite or granite rock, and dry gravelly, clayey or sandy soil
|elevation=1100–4000 m
|distribution=Alta.;B.C.;Man.;Ont.;Sask.;Ariz.;Colo.;Idaho;Mont.;Nebr.;N.Mex.;N.Dak.;S.Dak.;Utah;Wyo.
|discussion=<p><i>Selaginella densa</i> has been treated as including three varieties: <i></i>var.<i> densa</i>, <i></i>var.<i> scopulorum</i> (Maxon) R. M. Tryon, and var. standleyi (Maxon) R. M. Tryon (R. M. Tryon 1955), which are recognized here at the species level. Intermediates between <i>S. densa</i> and the other two species of the group may represent ecological variations of the species, hybrids between species within the complex, or hybrids with other closely related species, such as <i>S. watsonii</i>. This group is in need of detailed systematic studies. Megasporangia with only two well-developed megaspores have been observed, which may indicate apogamy and the presence of different races as found in <i>S. rupestris</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Selaginella densa
|authority=Rydberg
|rank=species
|parent rank=subgenus
|synonyms=Selaginella rupestris var. densa
|basionyms=
|family=Selaginellaceae
|habitat=Prairies, alpine meadows, dry rocky slopes, rock crevices, sandstone, quartzite or granite rock, and dry gravelly, clayey or sandy soil
|elevation=1100–4000 m
|distribution=Alta.;B.C.;Man.;Ont.;Sask.;Ariz.;Colo.;Idaho;Mont.;Nebr.;N.Mex.;N.Dak.;S.Dak.;Utah;Wyo.
|reference=None
|publication title=Mem. New York Bot. Gard.
|publication year=1900
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V2/V2_656.xml
|genus=Selaginella
|subgenus=Selaginella subg. Tetragonostachys
|species=Selaginella densa
}}<!--

-->[[Category:Treatment]][[Category:Selaginella subg. Tetragonostachys]]